feat: support raw Vue SSR

[JohannesLamberts]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• All tests are passing
• New/updated tests are included

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information:

I did not set up a Nuxt app yet, but tested with a basic Vue SSR application. I'm happy to double-check if the Nuxt Plugin still works in case the PR looks good otherwise :)

[codecov-io]

Codecov Report

Merging #90 into master will not change coverage by %.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #90   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         5    +1     
  Lines           90       112   +22     
  Branches        14        19    +5     
=========================================
+ Hits            90       112   +22     

Impacted Files	Coverage Δ
src/index.ts	100.00% <100.00%> (ø)
src/ssrPlugin.ts	100.00% <100.00%> (ø)

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[JohannesLamberts]

@posva I can get back to the MR next week to resolve the codecov issues. Would you accept setting thresholds in jest.config.js to get faster feedback on coverage?

[posva]

Thank you for this! I haven’t had the time yet to check it but I will try to this week or next week

[posva]

Thanks a lot for this! There are a few minor things to change and other style-related changes I will change locally after merging

[posva]

Thank you!